The 49ers released their depth chart for Monday night’s season opener against the Minnesota Vikings, all without naming their second starting cornerback or their primary return specialist.

While Tramaine Brock starts at left cornerback, the right cornerback spot will be manned by Kenneth Acker “or” Keith Reaser, according to the depth chart. Coach Jim Tomsula declined Tuesday to reveal whether Acker or Reaser will start, and they’ll likely both be on the field anyhow when the 49ers need three cornerbacks in their nickel coverage.

The depth chart also didn’t clear up whether Jarryd Hayne will make his NFL debut as a return specialist. He is listed as an option with Reggie Bush and Bruce Ellington on punt returns, and with Bush and DeAndrew White on kickoff returns.